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LF: LPF inductor cores possible cause?

To: <[email protected]>
Subject: LF: LPF inductor cores possible cause?
From: "J. Allen" <[email protected]>
Date: Fri, 1 Sep 2006 19:30:29 -0000
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Jim and All,

Thanks for the good explanation. The spikes are displayed on the scope which is connected to the ScopeMatch and are on both the voltage and current traces.

The scopematch pickup has a half meter section of coax between it and the LPF, which in turn has an even shorter coax jumper connecting it to the amp output. The LPF uses two single-layer, air-core, solenoid inductors mounted at right angles to each other.

Your comments raised a set of questions:

Could it be that the single 640 FET amp and this Push Pull amp with 2 640 are such different designs that the air core inductor LPF which works well with one, does not work with the other?

Is it possible that some odd inductive or capacitive coupling lets those high frequency spikes be generated?

If this is the cause of the spikes, will it require a pair of toroid cores, or will a pair of TV cores suffice?

Order toroid cores,  yes or no?

Thanks,

J.





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